1 files changed, 1 insertions, 144 deletions
diff --git a/gerbonara/gerber/utils.py b/gerbonara/gerber/utils.py
index c2e81cd..492321a 100644
--- a/gerbonara/gerber/utils.py
+++ b/gerbonara/gerber/utils.py
@@ -61,7 +61,7 @@ def parse_gerber_value(value, settings):
 
     """
 
-    if value is None:
+    if not value:
         return None
 
     # Handle excellon edge case with explicit decimal. "That was easy!"
@@ -317,146 +317,3 @@ def sq_distance(point1, point2):
     return diff1 * diff1 + diff2 * diff2
 
 
-def listdir(directory, ignore_hidden=True, ignore_os=True):
-    """ List files in given directory.
-    Differs from os.listdir() in that hidden and OS-generated files are ignored
-    by default.
-
-    Parameters
-    ----------
-    directory : str
-        path to the directory for which to list files.
-
-    ignore_hidden : bool
-        If True, ignore files beginning with a leading '.'
-
-    ignore_os : bool
-        If True, ignore OS-generated files, e.g. Thumbs.db
-
-    Returns
-    -------
-    files : list
-        list of files in specified directory
-    """
-    os_files = ('.DS_Store', 'Thumbs.db', 'ethumbs.db')
-    files = os.listdir(directory)
-    if ignore_hidden:
-        files = [f for f in files if not f.startswith('.')]
-    if ignore_os:
-        files = [f for f in files if not f in os_files]
-    return files
-
-def ConvexHull_qh(points):
-    #a hull must be a planar shape with nonzero area, so there must be at least 3 points
-    if(len(points)<3):
-        raise Exception("not a planar shape")
-    #find points with lowest and highest X coordinates
-    minxp=0;
-    maxxp=0;
-    for i in range(len(points)):
-        if(points[i][0]<points[minxp][0]):
-            minxp=i;
-        if(points[i][0]>points[maxxp][0]):
-            maxxp=i;
-    if minxp==maxxp:
-        #all points are collinear
-        raise Exception("not a planar shape")
-    #separate points into those above and those below the minxp-maxxp line
-    lpoints=[]
-    rpoints=[]
-    #to detemine if point X is on the left or right of dividing line A-B, compare slope of A-B to slope of A-X
-    #slope is (By-Ay)/(Bx-Ax)
-    a=points[minxp]
-    b=points[maxxp]
-    slopeab=atan2(b[1]-a[1],b[0]-a[0])
-    for i in range(len(points)):
-        p=points[i]
-        if i == minxp or i == maxxp:
-            continue
-        slopep=atan2(p[1]-a[1],p[0]-a[0])
-        sdiff=slopep-slopeab
-        if(sdiff<pi):sdiff+=2*pi
-        if(sdiff>pi):sdiff-=2*pi
-        if(sdiff>0):
-            lpoints+=[i]
-        if(sdiff<0):
-            rpoints+=[i]
-    hull=[minxp]+_findhull(rpoints, maxxp, minxp, points)+[maxxp]+_findhull(lpoints, minxp, maxxp, points)
-    hullo=_optimize(hull,points)
-    return hullo
-
-def _optimize(hull,points):
-    #find triplets that are collinear and remove middle point
-    toremove=[]
-    newhull=hull[:]
-    l=len(hull)
-    for i in range(l):
-        p1=hull[i]
-        p2=hull[(i+1)%l]
-        p3=hull[(i+2)%l]
-        #(p1.y-p2.y)*(p1.x-p3.x)==(p1.y-p3.y)*(p1.x-p2.x)
-        if (points[p1][1]-points[p2][1])*(points[p1][0]-points[p3][0])==(points[p1][1]-points[p3][1])*(points[p1][0]-points[p2][0]):
-            toremove+=[p2]
-    for i in toremove:
-        newhull.remove(i)
-    return newhull
-
-def _distance(a, b, x):
-    #find the distance between point x and line a-b
-    return abs((b[1]-a[1])*x[0]-(b[0]-a[0])*x[1]+b[0]*a[1]-a[0]*b[1])/sqrt((b[1]-a[1])**2 + (b[0]-a[0])**2 );
-
-def _findhull(idxp, a_i, b_i, points):
-    #if no points in input, return no points in output
-    if(len(idxp)==0):
-        return [];
-    #find point c furthest away from line a-b
-    farpoint=-1
-    fdist=-1.0;
-    for i in idxp:
-        d=_distance(points[a_i], points[b_i], points[i])
-        if(d>fdist):
-            fdist=d;
-            farpoint=i
-    if(fdist<=0):
-        #none of the points have a positive distance from line, bad things have happened
-        return []
-    #separate points into those inside triangle, those outside triangle left of far point, and those outside triangle right of far point
-    a=points[a_i]
-    b=points[b_i]
-    c=points[farpoint]
-    slopeac=atan2(c[1]-a[1],c[0]-a[0])
-    slopecb=atan2(b[1]-c[1],b[0]-c[0])
-    lpoints=[]
-    rpoints=[]
-    for i in idxp:
-        if i==farpoint:
-            #ignore triangle vertex
-            continue
-        x=points[i]
-        #if point x is left of line a-c it's in left set
-        slopeax=atan2(x[1]-a[1],x[0]-a[0])
-        if slopeac==slopeax:
-            continue
-        sdiff=slopeac-slopeax
-        if(sdiff<-pi):sdiff+=2*pi
-        if(sdiff>pi):sdiff-=2*pi
-        if(sdiff<0):
-            lpoints+=[i]
-        else:
-            #if point x is right of line b-c it's in right set, otherwise it's inside triangle and can be ignored
-            slopecx=atan2(x[1]-c[1],x[0]-c[0])
-            if slopecx==slopecb:
-                continue
-            sdiff=slopecx-slopecb
-            if(sdiff<-pi):sdiff+=2*pi
-            if(sdiff>pi):sdiff-=2*pi
-            if(sdiff>0):
-                rpoints+=[i]
-    #the hull segment between points a and b consists of the hull segment between a and c, the point c, and the hull segment between c and b
-    ret=_findhull(rpoints, farpoint, b_i, points)+[farpoint]+_findhull(lpoints, a_i, farpoint, points)
-    return ret
-
-
-def convex_hull(points):
-    vertices = ConvexHull_qh(points)
-    return [points[idx] for idx in vertices]